Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Exhibit
access-list 101 deny tcp 192.168.10.0 0.0.0.255 host 10.1.1.10 eq 23 access-list 101 permit ip any any ! interface g0/1 ip access-group 101 out
Exhibit: A router is configured with an access list intended to block Telnet from 192.168.10.0/24 to 10.1.1.10, but Telnet still works. What is the most likely reason?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
The ACL must use wildcard mask 255.255.255.0 instead of 0.0.0.255
Cisco wildcard masks work the other way around, so 0.0.0.255 is correct for a /24.
B
Best answer
The ACL is applied in the wrong place or direction
The configuration logic points to an attachment problem rather than a syntax problem.
C
Distractor review
Standard ACLs should always be used for Telnet filtering
Extended ACLs are preferred when matching protocol and destination.
D
Distractor review
The router must run PAT before ACLs can filter Telnet
ACL filtering does not depend on PAT.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Related practice questions
Related 200-301 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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Practise IPv4 subnetting, CIDR, masks, host ranges and subnet selection.
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CCNA NAT practice questions
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Practise trunk verification and VLAN forwarding across switches.
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Practise WLAN security, authentication and wireless architecture concepts.
CCNA IPv6 practice questions
Practise IPv6 addressing, routes, neighbour discovery and common IPv6 exam traps.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: The ACL is applied in the wrong place or direction — Extended ACLs should be placed as close to the source as practical. If the ACL is applied in the wrong direction or on the wrong interface, the unwanted traffic will pass before it ever hits the filter.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
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